One is probably link local the other is global, that’s pretty normal. https://en.wikipedia.org/wiki/IPv6_address#Address_Scopes

Sadly very typical for science journalists.

a good manual grinder will beat any fancy electric one

You mean the price/quality ratio? Sure. I used to use Hario Skerton at work, and it’s been doing its job fine, although adjusting the grind was quite annoying. Also i think it has a very narrow adjustment range, which might be a problem if you use different brewing techniques.

The design is very human.

xmpp is closer to IRC than to modern communications protocols. End-to-end encryption, for example, is an optional protocol extension, which hasn’t even been formally finalized yet (and probably won’t ever be, given it’s been 10 years now)